[英]How to get bind to base viewmodel from contextmenu inside treeview?
我无法在contextMenu中将选择绑定到命令EditCommand。 我在树状视图中的按钮绑定到它很好,但是在菜单中它失败了。 我已经读过这很可能是由于contextMenu位于不同的UI树中,但是使用findAncestor和标签的解决方案对我来说不起作用。 无论如何有绑定并且仍然能够将treeViewItem传递给方法吗?
我的XAML:
<TreeView Background="Transparent"
Margin="10"
Grid.Column="0" Grid.Row="1"
ItemsSource="{Binding Path=TreeViewItems}">
<TreeView.ItemTemplate >
<HierarchicalDataTemplate DataType="{x:Type model:TreeViewSelection}" ItemsSource="{Binding Configs}" >
<DockPanel HorizontalAlignment="Stretch" Background="Transparent"><!--Transparency allows context click on whole row-->
<DockPanel.ContextMenu>
<ContextMenu DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
<MenuItem
Header="Edit"
Command="{Binding ElementName=userControl, Path=DataContext.EditCommand}"<!--Doesn't work-->
CommandParameter="{Binding}">
<MenuItem.Icon>
<Image Source="../Images/edit.png" />
</MenuItem.Icon>
</MenuItem>
</ContextMenu>
</DockPanel.ContextMenu>
<TextBlock DockPanel.Dock="Left" Text="{Binding Title}" />
<StackPanel DockPanel.Dock="Right"
Orientation="Horizontal"
HorizontalAlignment="Right">
<Button Height="23" Width="23"
Command="{Binding ElementName=userControl, Path=DataContext.EditCommand}"<!--Works-->
CommandParameter="{Binding}"
Style="{DynamicResource ImageNoTextButton}"
inf:AttachedProperties.Image="../Images/edit.png"
inf:AttachedProperties.ImageMouseOver="../Images/editMouseOver.png" />
</StackPanel>
</DockPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
尝试这个:
<DockPanel HorizontalAlignment="Stretch" Background="Transparent"
Tag="{Binding RelativeSource={RelativeSource AncestorType=UserControl}}">
<DockPanel.ContextMenu>
<ContextMenu>
<MenuItem
Header="Edit"
Command="{Binding Path=PlacementTarget.Tag.DataContext.EditCommand, RelativeSource={RelativeSource AncestorType=ContextMenu}}"
CommandParameter="{Binding}">
<MenuItem.Icon>
<Image Source="../Images/edit.png" />
</MenuItem.Icon>
</MenuItem>
</ContextMenu>
</DockPanel.ContextMenu>
...
</DockPanel>
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